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Discussion on: Kotlin: How Can a Programming Language be so Young And so Mature at The Same Time?

 
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Alex Fedorov

Of course, such old code will need to be upgraded to recent version of Java anyways.

I did recently a migration from JS to TS, and it is still quite painful. You have to hunt a lot of TS config options to make them just right so that JS + TS can work together and not get into any 'import' errors.